SRI about the bad luck Chris. If DC power was present even though the radio was powered down it is very likely that electrolysis may have corroded a trace of print. That would be the best possible outcome. Look for white or green power and crystals (or where they were before cleaning) If you have a neighbor with the same model you could mix and match control and radio and see of the problem is isolated. If the water was clean (free of dirt, etc) you may still come out OK. Also the factory may give an estimate without incurring much cost.
all the best, steve nu5d -- NU5D - Nickel Under Five Dollars